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Consolidated Balance Sheets (Parentheticals) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement Of Financial Position [Abstract]      
Loans, allowance for credit losses (in dollars) $ 3,150,251 $ 3,117,870 $ 2,972,019
Common stock, par value (in dollars per share) $ 1 $ 1 $ 1
Common stock, shares authorized 15,000,000 15,000,000 15,000,000
Common stock, shares issued 2,773,361 2,760,964 2,747,370
Common stock, shares outstanding 2,773,361 2,760,964 2,747,370